adopters: add U-Next case studies (#4089)#4098

Merged

ran-huang merged 1 commit intopingcap:release-2.1from ti-srebot:release-2.1-6055aa148f6c

Oct 28, 2020

+1

Commits on Oct 28, 2020

cherry pick pingcap#4089 to release-2.1

ran-huang
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